JP4973962B2 - Light source device and projector - Google Patents

Description

  The present invention relates to a light source device and a projector.

  2. Description of the Related Art Today, data projectors are widely used as image projection apparatuses that project a screen of a personal computer, a video image, an image based on image data stored in a memory card or the like onto a screen. This projector focuses light emitted from a light source on a micromirror display element called DMD (digital micromirror device) or a liquid crystal plate, and displays a color image on a screen.

  With the spread of video equipment such as personal computers and DVD players, the use of projectors has expanded from business presentations to home use. Conventionally, projectors using a high-intensity discharge lamp as a light source have been the mainstream of such projectors. However, in recent years, many developments and proposals using a semiconductor light emitting element such as a laser diode as a light source have been made. For example, an excitation light source that emits light in a blue wavelength band by a laser diode, and a phosphor wheel that has a phosphor layer that absorbs light emitted from the excitation light source and converts it into visible light, and is rotationally driven by a motor A light source device including a (rotary plate) and a projector including the light source device have been proposed. However, when this fluorescent wheel is irradiated with excitation light having a large light energy, when the region where the excitation light on the fluorescent wheel is irradiated is biased when used for a long time, the fluorescent wheel is partially As a result, the deterioration rate is accelerated, and as a result, color spots may occur in the phosphor.

  Therefore, Patent Document 1 shown below discloses a projector that controls the lighting operation of the lamp in accordance with the rotation state of the fluorescent wheel.

JP 2006-9879A

  However, the projector described above does not turn on the lamp unless the fluorescent wheel rotates, and does not suppress the deterioration of the phosphor due to secular change based on the bias of the use area, the occurrence of color spots, and the like. There wasn't.

  The present invention has been made in view of the problems of the prior art as described above, and by appropriately managing and changing the irradiation range of the light beam in the fluorescent wheel, partial degradation of the phosphor is suppressed, and for a long time. It is an object of the present invention to provide a light source device that emits light of a clear and stable color and a projector that can project a clear image.

A light source apparatus according to the present invention includes a light source phosphor layer to be irradiated and the fluorescence wheel arranged circumferentially, and a driving device for rotating the fluorescent wheel, the excitation light to the phosphor layer of the luminescent wheel, and irradiation control means for controlling the lighting start timing of the light source, the irradiation time integrator for integrating by dividing the excitation light irradiation time to the fluorescent wheel by the light source for each of a plurality of predetermined regions of the luminescent wheel, said irradiation and integration time storing means for storing the illumination time for each predetermined region, which is accumulated by the time integrating means, based on between time totalization of the stored in the integrated time storing means each predetermined region, a plurality of the luminescent wheel excitation light in a predetermined area, characterized in that it comprises an irradiation range control means for equalizing the time of irradiated.

And a rotation position detecting means for detecting a rotation reference position provided on the fluorescent wheel, wherein the irradiation range control means is configured to add the accumulated time in any one of the predetermined areas stored in the accumulated time storage means. When a predetermined value is exceeded, the lighting control unit changes the lighting start timing of the light source based on the rotation reference position of the fluorescent wheel detected by the rotational position detection unit by the irradiation control unit, thereby a plurality of predetermined regions of the fluorescent wheel. The time during which the excitation light is irradiated is equalized.
Moreover, the fluorescent wheel in the light source device according to the present invention is such that the phosphor of the same color component is applied over the entire circumference.

Furthermore, the irradiation time integrating means in the light source apparatus according to the present invention is to totalized value multiplied by the coefficient corresponding to the light intensity in the irradiation time by the intensity of the excitation light and the irradiation time.

The light source apparatus according to the present invention, the fluorescent further comprising a rotational position detecting means for detecting a rotational reference position provided in the wheel, the driving device rotationally drives the luminescent wheel at a constant speed, the irradiation range control means is for turning on the light source by controlling the irradiation control means the rotational position detecting means by Rikai rolling reference position from the detected time constant is slow during a predetermined time to.
Further, when the irradiation control means irradiates excitation light from the light source in one frame for 1 / j period, and the driving device rotates the fluorescent wheel at a speed that is not an integral multiple of j per frame rate, the irradiation range The control means equalizes the time during which the excitation light is irradiated to a plurality of predetermined areas of the fluorescent wheel based on the accumulated time of each predetermined area stored in the accumulated time storage means.

  A projector according to the present invention includes the light source device described above, a display element, a light source side optical system that guides light from the light source device to the display element, a light guide optical system, and an image emitted from the display element. A projection-side optical system that projects onto a screen; and a projector control unit that controls the light source device and the display element.

The projector according to the present invention includes a red light source that emits red wavelength band light, a blue light source that emits blue wavelength band light, an excitation light source that emits excitation light, and a green wavelength band that receives excitation light from the excitation light source. Light source-side optics that condenses the fluorescent wheel in which phosphor layers emitting light are arranged circumferentially, the red wavelength band light, the blue wavelength band light, and the green wavelength band light on the same optical path system and a driving device for rotating the luminescent wheel, and irradiation control means for sequentially emit light with the red wavelength band light and the light in the blue wavelength band and the green wavelength band light, the excitation to the luminescent wheel according to the excitation light source An irradiation time integration unit that divides and integrates the light irradiation time for each of a plurality of predetermined regions of the fluorescent wheel, and an integration time that stores the irradiation time for each of the predetermined regions integrated by the irradiation time integration unit And憶means, said stored in said integrated time storage means based on between time totalization for each predetermined area, the irradiation range control means for equalizing the time in which a plurality of excitation light in a predetermined region is irradiation of the luminescent wheel Are preferably provided.

  According to the present invention, a light source device that emits light of a clear and stable color over a long period of time can be obtained by appropriately managing and changing the irradiation range of the light beam on the fluorescent wheel to suppress partial deterioration of the phosphor. A projector capable of projecting a simple image can be provided.

1 is an external perspective view showing a projector according to an embodiment of the invention. 1 is a schematic plan view showing an internal structure of a projector according to an embodiment of the invention. It is a figure which shows the functional block of the projector which concerns on the Example of this invention. It is a schematic circuit block diagram regarding the projection processing of the projector which concerns on the Example of this invention. It is explanatory drawing which shows an example of the irradiation range division | segmentation plan of the fluorescent wheel of the projector which concerns on the Example of this invention. It is explanatory drawing regarding the irradiation time management data and irradiation range data of the fluorescent wheel which concerns on the Example of this invention. It is a flowchart which shows the flow which controls the irradiation range of the fluorescent wheel of the projector which concerns on the Example of this invention.

Hereinafter, the embodiments of the present invention will be explained in detail with reference to FIG. FIG. 1 is an external perspective view of the projector 10. In this embodiment, left and right in the projector 10 indicate the left and right direction with respect to the projection direction, and front and rear indicate the screen side direction of the projector 10 and the front and rear direction with respect to the traveling direction of the light beam.

  As shown in FIG. 1, the projector 10 has a substantially rectangular parallelepiped shape, and has a lens cover 19 that covers the projection port on the side of the front panel 12 that is a front side plate of the projector housing. The panel 12 is provided with a plurality of intake holes 18. Further, although not shown, an Ir receiver for receiving a control signal from the remote controller is provided.

  In addition, a key / indicator unit 37 is provided on the top panel 11 of the housing. The key / indicator unit 37 switches a power switch key, a power indicator for notifying power on / off, and switching on / off of projection. Keys and indicators such as an overheat indicator for notifying when a projection switch key, a light source unit, a display element, a control circuit, etc. are overheated are arranged.

  In addition, on the rear surface of the housing, there are provided various terminals 20 such as an input / output connector section and a power adapter plug that provide a USB terminal, a D-SUB terminal for image signal input, an S terminal, an RCA terminal, etc. on the rear panel. Yes. In addition, a plurality of intake holes are formed in the back panel. A plurality of exhaust holes 17 are formed in each of the right panel, which is a side plate of the housing (not shown), and the left panel 15, which is the side plate shown in FIG. An intake hole 18 is also formed at a corner near the back panel of the left panel 15. Further, a plurality of intake holes or exhaust holes are also formed in the vicinity of the front, back, left and right panels of the lower panel (not shown).

  Next, the internal structure of the projector 10 will be described. FIG. 2 is a schematic plan view showing the internal structure of the projector 10. The projector 10 includes a control circuit board 241 in the vicinity of the right panel 14 as shown in FIG. The control circuit board 241 includes a power circuit block, a light source control block, and the like. In addition, the projector 10 includes a light source unit 60 on the side of the control circuit board 241, that is, at a substantially central portion of the projector housing. Further, the projector 10 includes an optical system unit 160 between the light source unit 60 and the left panel 15.

  The light source unit 60 includes an excitation light irradiation device 70 disposed in the vicinity of the rear panel 13 at a substantially central portion in the left-right direction of the projector housing, and an optical axis of a light beam emitted from the excitation light irradiation device 70. A fluorescent light emitting device 100 disposed in the vicinity of the front panel 12, a blue light source device 300 disposed in the vicinity of the front panel 12 so as to be parallel to the light bundle emitted from the fluorescent light emitting device 100, and excitation. Red light source device 120 disposed between light irradiation device 70 and fluorescent light emitting device 100, light emitted from fluorescent light emitting device 100, light emitted from red light source device 120, light emitted from blue light source device 300 A light source side optical system 140 that converts the respective axes so as to be the same optical axis and collects each color light at the entrance of the light tunnel 175 that is a predetermined surface.

  The excitation light irradiation device 70 includes an excitation light source 71 arranged so that the optical axis thereof is parallel to the back panel 13, and a reflection mirror group 75 that converts the optical axis of light emitted from the excitation light source 71 by 90 degrees in the direction of the front panel 12. And a condensing lens 78 that condenses the light emitted from the excitation light source 71 reflected by the reflection mirror group 75, and a heat sink 81 disposed between the excitation light source 71 and the right panel 14.

  The excitation light source 71 includes a total of 24 blue laser diodes in 3 rows and 8 columns arranged in a matrix. On the optical axis of each blue laser diode, the light emitted from each blue laser diode is converted into parallel light. A collimator lens 73, which is a condenser lens, is disposed. The reflection mirror group 75 includes a plurality of reflection mirrors arranged in a stepped manner, and reduces the cross-sectional area of the light beam emitted from the excitation light source 71 in one direction and emits it to the condensing lens 78.

  A cooling fan 261 is disposed between the heat sink 81 and the back panel 13, and the excitation light source 71 is cooled by the cooling fan 261 and the heat sink 81. Further, a cooling fan 261 is also disposed between the reflection mirror group 75 and the back panel 13, and the reflection mirror group 75 and the condenser lens 78 are cooled by the cooling fan 261.

  The fluorescent light emitting device 100 is arranged so as to be parallel to the front panel 12, that is, the fluorescent wheel 101 disposed so as to be orthogonal to the optical axis of the emitted light from the excitation light irradiation device 70, and the fluorescent wheel 101 is rotationally driven. And a condensing lens group 111 that condenses the light bundle emitted from the fluorescent wheel 101 toward the rear panel 13.

  The fluorescent wheel 101 is a disk-shaped metal substrate, and an annular fluorescent light emitting region that emits fluorescent light in the green wavelength band using the light emitted from the excitation light source 71 as excitation light is formed as a recess, and the excitation light And functions as a fluorescent plate that emits fluorescence. In addition, the surface of the fluorescent light wheel 101 including the fluorescent light emitting region on the side of the excitation light source 71 is mirror-processed by silver deposition or the like to form a reflective surface that reflects light, and a green phosphor layer is formed on the reflective surface. It is laid. The fluorescent wheel 101 has a rotation reference position 101a provided for detecting a rotation reference position, and the rotation reference position 101a is provided by applying a magnetic material or the like.

  The light emitted from the excitation light irradiating device 70 applied to the green phosphor layer of the fluorescent wheel 101 excites the green phosphor in the green phosphor layer, and the light bundle is emitted in all directions from the green phosphor. Is emitted directly to the excitation light source 71 side or after being reflected by the reflection surface of the fluorescent wheel 101 to the excitation light source 71 side. Moreover, the excitation light irradiated to the metal substrate without being absorbed by the phosphor of the phosphor layer is reflected by the reflecting surface and is incident on the phosphor layer again to excite the phosphor. Therefore, by using the surface of the concave portion of the fluorescent wheel 101 as a reflective surface, the utilization efficiency of the excitation light emitted from the excitation light source 71 can be increased, and the light can be emitted more brightly.

  In the excitation light reflected on the phosphor layer side by the reflecting surface of the fluorescent wheel 101, the excitation light emitted to the excitation light source 71 side without being absorbed by the phosphor passes through a first dichroic mirror 141 described later. Since the fluorescent light is reflected by the first dichroic mirror 141, the excitation light is not emitted to the outside. A cooling fan 261 is disposed between the wheel motor 110 and the front panel 12, and the fluorescent wheel 101 is cooled by the cooling fan 261.

  The red light source device 120 includes a red light source 121 disposed so that the optical axis is parallel to the excitation light source 71, and a condensing lens group 125 that condenses the light emitted from the red light source 121. The red light source device 120 is disposed so that the optical axis intersects the light emitted from the excitation light irradiation device 70 and the green wavelength band light emitted from the fluorescent wheel 101. The red light source 121 is a red light emitting diode as a semiconductor light emitting element that emits red wavelength band light. Furthermore, the red light source device 120 includes a heat sink 130 disposed on the right panel 14 side of the red light source 121. A cooling fan 261 is disposed between the heat sink 130 and the front panel 12, and the red light source 121 is cooled by the cooling fan 261.

  The blue light source device 300 includes a blue light source 301 disposed so as to be parallel to the optical axis of the light emitted from the fluorescent light emitting device 100, and a condenser lens group 305 that collects the light emitted from the blue light source 301. Prepare. The blue light source device 300 is arranged so that the light emitted from the red light source device 120 and the optical axis intersect. The blue light source 301 is a blue light emitting diode as a semiconductor light emitting element that emits light in a blue wavelength band. Furthermore, the blue light source device 300 includes a heat sink 310 disposed on the front panel 12 side of the blue light source 301. A cooling fan 261 is disposed between the heat sink 310 and the front panel 12, and the blue light source 301 is cooled by the cooling fan 261.

  The light source side optical system 140 is a condensing lens that condenses the light bundles in the red, green, and blue wavelength bands, a dichroic mirror that converts the optical axes of the light bundles in the respective color wavelength bands into the same optical axis, etc. Consists of. Specifically, the optical axis of the blue wavelength band light emitted from the excitation light irradiation device 70 and the green wavelength band light emitted from the fluorescent wheel 101, and the optical axis of the red wavelength band light emitted from the red light source device 120 The first dichroic mirror 141 that transmits the blue and red wavelength band light, reflects the green wavelength band light, and converts the optical axis of the green light by 90 degrees toward the left panel 15 is disposed at the position where ing.

  Further, the blue wavelength band light is transmitted at a position where the optical axis of the blue wavelength band light emitted from the blue light source device 300 and the optical axis of the red wavelength band light emitted from the red light source device 120 intersect, A second dichroic mirror 148 that reflects green and red wavelength band light and converts the optical axes of the green and red light in the direction of the rear panel 13 by 90 degrees is disposed. A condensing lens is disposed between the first dichroic mirror 141 and the second dichroic mirror 148. Further, in the vicinity of the light tunnel 175, a condenser lens 173 that condenses the light source light at the entrance of the light tunnel 175 is disposed.

  The optical system unit 160 includes an illumination side block 161 located on the left side of the excitation light irradiation device 70, an image generation block 165 located near a position where the back panel 13 and the left panel 15 intersect, and a light source side optical system. The projection-side block 168 located between the 140 and the left panel 15 is configured in a substantially U-shape.

  The illumination side block 161 includes a part of a light guide optical system 170 that guides the light source light emitted from the light source unit 60 to the display element 51 provided in the image generation block 165. The light guide optical system 170 included in the illumination side block 161 includes a light tunnel 175 that uses a light beam emitted from the light source unit 60 as a light flux having a uniform intensity distribution, and a light collecting unit that collects light emitted from the light tunnel 175. There are an optical lens 178, an optical axis conversion mirror 181 that converts the optical axis of the light beam emitted from the light tunnel 175 in the direction of the image generation block 165, and the like.

  As the light guide optical system 170, the image generation block 165 has a condensing lens 183 that condenses the light source light reflected by the optical axis conversion mirror 181 on the display element 51, and a light beam transmitted through the condensing lens 183 as a display element. And an irradiation mirror 185 that irradiates 51 at a predetermined angle. Further, the image generation block 165 includes a DMD serving as the display element 51, and a heat sink 190 for cooling the display element 51 is disposed between the display element 51 and the rear panel 13. Element 51 is cooled. Further, a condensing lens 195 as the projection-side optical system 220 is disposed in the vicinity of the front surface of the display element 51.

  The projection-side block 168 has a lens group of the projection-side optical system 220 that emits ON light reflected by the display element 51 to the screen. The projection-side optical system 220 includes a fixed lens group 225 built in a fixed lens barrel and a movable lens group 235 built in a movable lens barrel, and is a variable focus lens having a zoom function, and is movable by a lens motor. Zoom adjustment and focus adjustment can be performed by moving the lens group 235.

  Next, projector control means of the projector 10 will be described with reference to the block diagram of FIG. The projector control means includes a control unit 38, an input / output interface 22, an image conversion unit 23, a display encoder 24, a display drive unit 26, and the like. The control unit 38 controls the operation of each circuit in the projector 10, and is composed of a ROM in which operation programs such as a CPU and various settings are fixedly stored, a RAM used as a work memory, and the like. Yes.

  Then, the image signal of various standards input from the input / output connector unit 21 by the projector control means is in a predetermined format suitable for display by the image conversion unit 23 via the input / output interface 22 and the system bus (SB). After being converted so as to be unified into an image signal, it is output to the display encoder 24.

  The display encoder 24 develops and stores the input image signal in the video RAM 25, generates a video signal from the stored contents of the video RAM 25, and outputs the video signal to the display drive unit 26.

  The display drive unit 26 functions as display element control means, and drives the display element 51, which is a spatial light modulation element (SOM), at an appropriate frame rate corresponding to the image signal output from the display encoder 24. The light beam emitted from the light source unit 60 is irradiated onto the display element 51 through the light guide optical system, thereby forming an optical image with the reflected light of the display element 51, and a projection side optical system to be described later The image is projected and displayed on a screen (not shown). The movable lens group 235 of the projection side optical system is driven by the lens motor 45 for zoom adjustment and focus adjustment.

  The image compression / decompression unit 31 performs a recording process in which the luminance signal and the color difference signal of the image signal are data-compressed by a process such as ADCT and Huffman coding, and sequentially written in a memory card 32 that is a detachable recording medium. Further, the image compression / decompression unit 31 reads the image data recorded on the memory card 32 in the reproduction mode, decompresses individual image data constituting a series of moving images in units of one frame, and converts the image data into the image conversion unit 23. Is output to the display encoder 24 and the processing for enabling the display of a moving image or the like based on the image data stored in the memory card 32 is performed.

  Then, an operation signal of a key / indicator unit 37 composed of a main key and an indicator provided on the top panel 11 of the housing is directly sent to the control unit 38, and a key operation signal from the remote controller is received by Ir. The code signal received by the unit 35 and demodulated by the Ir processing unit 36 is output to the control unit 38.

  Note that an audio processing unit 47 is connected to the control unit 38 via a system bus (SB). The sound processing unit 47 includes a sound source circuit such as a PCM sound source, converts the sound data into analog in the projection mode and the playback mode, and drives the speaker 48 to emit loud sounds.

  Further, the control unit 38 controls the light source control circuit 41, and the light source unit 60 is configured such that light of a predetermined wavelength band required at the time of image generation is emitted from the light source unit 60 via the light source control circuit 41. The light emission of the excitation light irradiation device, the red light source device, and the blue light source device is individually controlled.

  Further, the control unit 38 causes the cooling fan drive control circuit 43 to perform temperature detection using a plurality of temperature sensors provided in the light source unit 60 and the like, and controls the rotation speed of the cooling fan from the result of the temperature detection. Further, the control unit 38 causes the cooling fan drive control circuit 43 to keep the cooling fan rotating even after the projector body is turned off by a timer or the like, or to turn off the projector body depending on the result of temperature detection by the temperature sensor. Control is also performed.

  Next, a circuit block relating to the control of the projection system for controlling the irradiation range of the fluorescent wheel 101 in the present invention will be described with reference to FIG. The control unit 38 described in the functional block diagram of FIG. 3 includes a projection processing CPU 53 that is a CPU that performs projection processing. The projection processing CPU 53 is connected to a memory unit including a ROM 54, a RAM 55, and an EEPROM 56. The projection processing CPU 53 is connected to the image conversion unit 23. The image conversion unit 23 is a display that is a spatial light modulation element (SOM) by the display encoder 24, the video RAM 25, and the display drive unit 26 as described above. The element 51 is driven.

  Further, the projection processing CPU 53 controls the blue light source 301, the red light source 121, and the excitation light source 71 for generating green light via the light source control circuit 41, and the projection processing CPU 53 individually time-divides each light source. Control to emit light.

  Further, the projection processing CPU 53 is connected to a motor drive circuit for driving the wheel motor 110. The projection processing CPU 53 rotates the wheel motor 110 integrated with the fluorescent wheel 101 at a constant speed to thereby generate an excitation light source. It also functions as an irradiation control means for generating a green light by irradiating the fluorescent wheel 101 with the light beam 71.

The projection processing CPU 53 prevents concentration of energy on the fluorescent wheel 101 by rotating the fluorescent wheel 101 at a higher speed. For example, if the fluorescent wheel 101 is rotated 4 or 5 times per frame rate (for example, 50 Hz) and the emission of each color of red, green, and blue is controlled at an equal time, the laser beam is equivalent to 4/3 rotations or 1 frame. It is irradiated for 5/3 rotations. At this time, laser light is irradiated twice in a specific area of the fluorescent wheel 101, and irradiation is performed once in other areas. In other words, the projection processing CPU 53 rotates the fluorescent wheel 101 at a constant speed, and if the irradiation timing of the laser light during rotation is the same, the rotation speed is not an integer with respect to the irradiation time at one frame rate. In a specific area of the wheel 101, the irradiation time is doubled compared to other areas.

  Therefore, the projection processing CPU 53 serves as an irradiation range control means when the accumulated time stored in the accumulated time storage means, which is the RAM 55, exceeds a predetermined value. The amount of delay from the rotation reference position 101a detected by the element 52 is controlled to manage and change the position of the phosphor layer irradiated with the excitation light twice in one frame.

  The rotation position detection means may detect the rotation reference position arranged on the fluorescent wheel 101 using an optical element such as a reflective photoreflector instead of the Hall element 52.

  Further, the projection processing CPU 53 also functions as an irradiation time integrating means for integrating the irradiation time to the irradiation range of the phosphor layer irradiated with the excitation light of the fluorescent wheel 101 twice.

  Then, when the time accumulated by the irradiation time integrating means exceeds the threshold value stored in the ROM 54 serving as a threshold value storage memory, the projection processing CPU 53 causes the irradiation range control means to send the excitation light to the fluorescent wheel 101 in one frame. It also functions as an irradiation range management means for changing the irradiation range of the phosphor layer irradiated twice. Further, the projection processing CPU 53 as the irradiation time integration means integrates the irradiation time for each irradiation range of the fluorescent wheel 101 divided into a plurality of parts.

  That is, the projection processing CPU 53 rotates the fluorescent wheel 101 at a constant speed by the wheel motor 110 as a driving device, detects the rotation reference position 101a of the rotating fluorescent wheel 101, and from the timing at which the rotation reference position 101a is detected. The excitation light source 71 is turned on by delaying a predetermined time in consideration of the rotation speed of the fluorescent wheel 101.

  The projector 10 has, for example, a low-brightness mode that prioritizes color when watching a movie or the like, and a high-luminance mode that is used with priority on brightness such as a presentation. The projector 10 may vary the light intensity of the excitation light source 71 in accordance with these modes (luminance). Therefore, the projection processing CPU 53 as the irradiation time integrating means performs integration by multiplying the irradiation time by the light intensity coefficient in accordance with the intensity of the excitation light.

  The fluorescent wheel 101 has a rotation reference position 101a to which a magnetic material or the like is applied, and the projection processing CPU 53 has a hall element 52 serving as a rotation position detection means for detecting the rotation reference position 101a. It is connected.

  The ROM 54 stores a program for projection processing and the like, and also functions as a storage medium in which a program readable by the projection processing CPU 53 is stored. The ROM 54 also functions as a threshold value storage memory that stores a threshold value of the irradiation time for the irradiation range of the fluorescent wheel 101 in advance.

  The RAM 55 is provided with a work area for managing the irradiation time of each irradiation range of the plurality of irradiation ranges in the fluorescent wheel 101. The RAM 55 is a phosphor that is irradiated with excitation light twice in one frame. The accumulated time storage means stores data indicating the irradiation range of the fluorescent wheel 101 to be irradiated so that the irradiation time to the irradiation range of the layer is uniform.

  The EEPROM 56 captures and stores data indicating the irradiation time of each irradiation range stored in the work area of the RAM 55 and the irradiation range of the fluorescent wheel 101 to be irradiated at the next startup of the projector 10 when the projector 10 is turned off. This is a backup memory.

  Next, in managing the irradiation range of the fluorescent wheel 101, the division example of the irradiation range for equalizing the irradiation range of the fluorescent wheel 101, the irradiation time data of each irradiation range stored in the EEPROM 56, and the data The data indicating the irradiation range at the next startup of the projector 10 based on the above will be described with reference to the drawings. FIG. 5 is an explanatory diagram showing an example of an irradiation range division plan of the fluorescent wheel 101, and FIG. 6 is an explanatory diagram regarding irradiation time management data and irradiation range data based on the irradiation range division plan of FIG.

  As shown in FIG. 5, the fluorescent wheel 101 has a rotation reference position 101a provided with a magnetic material. As described above, the fluorescent wheel 101 is rotated at a constant speed via the wheel motor 110 integrated by the projection processing CPU 53. Then, the projection processing CPU 53 detects the rotation reference position 101a by the hall element 52, and thereby irradiates the fluorescent wheel based on the detection timing of the rotation reference position 101a or a delay of a predetermined time from the timing. The excitation light source 71 can be irradiated with a predetermined position on 101 as a start position.

  Then, as shown in FIG. 5, the fluorescent wheel 101 sets, for example, an area A101b, an area B101c, and an area C101d as the irradiation range divided into three as the irradiation range of the excitation light source 71. Irradiation time can be managed.

  The irradiation time management data and designated irradiation range data regarding each irradiation range of the fluorescent wheel 101 shown in FIG. 6 are stored in the EEPROM 56 which is a memory as described above. These data are stored when the power of the projector 10 is turned off, and indicate the designated irradiation range set based on the irradiation time of each irradiation range and a threshold time (for example, 500 hours) set in the ROM 54 in advance. Data and are saved.

  In FIG. 6, as described above, for example, the area A 101b, the area B 101c, and the area C 101d are set as the irradiation range of the excitation light source 71, and the rotation speed of the fluorescent wheel 101 is 1 It is assumed that the frame rotates four times. That is, the laser beam is irradiated for 4/3 rotations in one frame. When the rotation reference position 101a is set as the rotation start reference position, the laser beam is irradiated twice in the area A101b every time.

In the area A101b of the fluorescent wheel 101, the excitation light is irradiated twice in one frame, so that the excess irradiation time in which the excitation light is irradiated more than the other areas is accumulated, and 498 hours pass, and the power is turned off. In this case, as shown in FIG. 6A, data indicating that the extra irradiation time to the area A 101b is 498 hours is stored in the EEPROM 56. The data indicating the irradiation range when the projector 10 is activated next time is “A” data indicating that the area A101b is the area A101b because the extra irradiation time to the area A101b is less than the threshold time of 500 hours. .

When the projector 10 is started in the state of FIG. 6A and the projector 10 is turned off after the irradiation time of 36 hours, as shown in FIG. 6B, the extra irradiation time of the area A 101b is 501 hours. Since the threshold time of 500 hours has been exceeded, the data indicating the irradiation range when the projector 10 is activated next time is “B” data indicating that the area is set in the area B101c. That is, after detecting the rotation reference position 101a, the laser beam is irradiated with the time corresponding to 1/3 rotation of the fluorescent wheel 101 delayed.

Similarly, each area is changed by exceeding the threshold time as shown in FIGS. 6C to 6E, and the extra irradiation time in the area C101d is 500 as shown in FIG. 6E. When the power is turned off over the time, the threshold time is changed from 500 hours to 1000 hours, and the data indicating the irradiation range at the next startup of the projector 10 is returned to the area A101b. ".

  Next, the management of the irradiation time of each irradiation range of the fluorescent wheel 101 and the flow of operations for setting the irradiation range will be described with reference to the flowchart of FIG.

  The projector 10 executes a system activation process (Y in step S101) that activates the system when the user presses a power switch key (ON key). The projector 10 performs an initialization operation of each unit as a system activation process (Y in step S101).

  As an initialization operation of the projection system, the projection processing CPU 53 establishes a communication protocol with various ICs to be connected, and initializes devices such as the DMD and the wheel motor 110 that are the display elements 51 (step S103). .

  Then, when the projection processing CPU 53 confirms that the system is normal by the initialization processing (step S103), the motor driving processing for controlling the motor driving circuit to drive the wheel motor 110 to rotate the fluorescent wheel 101. (Step S105) is executed.

  Next, the projection processing CPU 53 performs data reading processing (step S107) for reading the data indicating the irradiation time of each irradiation range and the irradiation range of the fluorescent wheel 101 to be irradiated stored in the EEPROM 56 and developing them in the work area of the RAM 55. Execute.

  The projection processing CPU 53 reads data indicating the irradiation range of the fluorescent wheel 101 by the data reading process (step S107), and determines the irradiation range.

  Next, the projection processing CPU 53 sets the light emission timing of each light source in order to light each light source in a time division manner. Here, the projection processing CPU 53 detects the rotation reference position 101a of the fluorescent wheel 101 by the hall element 52 so that the light beam of the excitation light source 71 is irradiated to the previously set irradiation range of the fluorescent wheel 101. The detection process is executed, and the irradiation control unit emits the excitation light source 71 based on a delay of a predetermined time, thereby irradiating the irradiation range of the phosphor layer irradiated with the excitation light twice in one frame. The light source lighting process (step S109) is executed while executing the irradiation range control process.

  The projection processing CPU 53 causes each light source to emit light in a time-division manner, and at the same time, the irradiation time specified by the fluorescent light wheel 101 by the excitation light source 71 so that the irradiation time data of each irradiation range developed in the work area of the RAM 55 can be updated. An irradiation time integration process (step S111) for starting integration of the irradiation time of the phosphor layer irradiated with the excitation light twice during one frame to the range is executed.

  Then, the projector 10 in operation executes the power-off process (step S115) when the user presses the power switch key (OFF key) (Y in step S113). The projector 10 executes power-off processing of various ICs connected as power-off processing (step S115) and power-off processing of devices such as the DMD and the wheel motor 110 that are the display elements 51.

  The projection processing CPU 53 executes a light source extinguishing process (step S117) for stopping the time division control of each light source that has been emitted in time division and turning off each light source as a power-off process of the projection system. Thereby, the projection processing CPU 53 stops the integration of the irradiation time of the light beam to the specified irradiation range of the fluorescent wheel 101 by the excitation light source 71 and writes the integrated irradiation time in the work area of the RAM 55.

  Next, the projection processing CPU 53 executes a motor stop process (step S119) for controlling the motor drive circuit to stop the drive of the wheel motor 110 in order to stop the rotation of the fluorescent wheel 101.

  Then, the projection processing CPU 53 causes the EEPROM 56 to store the irradiation time of each irradiation range written in the work area of the RAM 55 and data indicating the irradiation range of the phosphor layer irradiated with the excitation light twice in the next one frame. A range management process (step S121) is executed, and the process ends.

  As described above, according to the present embodiment, the light source device that emits light with a clear and stable color over a long period of time by suppressing the deterioration of the phosphor by appropriately changing the irradiation range of the light beam in the fluorescent wheel 101. And a projector capable of projecting a clear image.

In the above embodiment, it is assumed that the rotation speed of the fluorescent wheel 101 is four rotations in one frame, but it is naturally not limited to this rotation speed. For example, as described above, when the projector 10 includes a low-luminance mode or a high-luminance mode projection mode, the output of the light source is changed according to the mode. At this time, the rotation speed of the fluorescent wheel 101 may be changed, for example, to 4 rotations in the low luminance mode and 5 rotations in the high luminance mode. As described above, even when the projection mode is randomly selected by the user and the rotation speed of the fluorescent wheel 101 may be changed, the irradiation times of the area A 101b, the area B 101c, and the area C 101d are respectively set as in the above-described embodiment. Accumulate. Then, since the rotation speed is not an integer with respect to the irradiation time per frame, the cumulative irradiation time of each area has a gradient in which the area A101b is the largest and the area C101d is the smallest. When the accumulated irradiation time of many areas A101b exceeds the above threshold time, the laser beam irradiation timing is adjusted so that the laser beams are irradiated from the area B101c at the start of the next projection , and the excitation light is irradiated to a predetermined region. The time should be equalized .

  In addition, by managing the irradiation time of the irradiation range of the excitation light source 71 divided into a plurality of ranges in the fluorescent wheel 101, respectively, since it can be managed to be irradiated uniformly, it is possible to suppress aging degradation, Occurrence of color spots and color changes can be prevented.

  Furthermore, the energy irradiation amount can be appropriately managed by multiplying the integration of the irradiation time of the irradiation range of the excitation light source 71 divided into a plurality of ranges in the fluorescent wheel 101 by a coefficient according to the light intensity.

  Further, since the fluorescent wheel 101 is controlled by being rotated at a constant speed, the irradiation range can be freely changed by controlling the lighting time of the excitation light source 71 and adjusting the irradiation start time. In this way, in the present embodiment, the irradiation range is divided into four parts so as to irradiate evenly. However, it is also possible to subdivide and irradiate evenly.

  Then, by managing the irradiation time of each irradiation range of the fluorescent wheel 101, the time for changing the irradiation range can be freely changed by setting the threshold value, so in this embodiment, the threshold time is set to 500 hours. However, the uniformity may be realized by switching in a short time.

  The present invention is not limited to the above embodiments, and can be freely changed and improved without departing from the gist of the invention.

10 Projector
11 Top panel 12 Front panel
13 Rear panel 14 Right panel
15 Left panel 17 Exhaust hole
18 Air intake hole 19 Lens cover
20 Various terminals 21 Input / output connector
22 I / O interface 23 Image converter
24 Display encoder 25 Video RAM
26 Display drive unit 31 Image compression / decompression unit
32 Memory card 35 Ir receiver
36 Ir processing section 37 Key / indicator section
38 Control unit 41 Light source control circuit
43 Cooling fan drive control circuit 45 Lens motor
47 Audio processor 48 Speaker
51 Display element 52 Hall element
53 Projection processing CPU 54 ROM
55 RAM 56 EEPROM
60 Light source unit 70 Excitation light irradiation device
71 Excitation light source 73 Collimator lens
75 Reflective mirror group 78 Condensing lens
81 Heat sink 100 Fluorescent light emitting device
101 Fluorescent wheel 101a Rotation reference position
101b Area A 101c Area B
101d Area C
110 Wheel motor 111 Condensing lens group
120 Red light source 121 Red light source
125 condenser lens group 130 heat sink
140 Light source side optical system 141 First dichroic mirror
148 Second dichroic mirror 160 Optical system unit
161 Lighting block 165 Image generation block
168 Projection side block 170 Light guiding optical system
173 Condensing lens 175 Light tunnel
178 Condensing lens 181 Optical axis conversion mirror
183 Condensing lens 185 Irradiation mirror
190 Heat sink 195 Condenser lens
220 Projection-side optical system 225 Fixed lens group
235 Movable lens group 241 Control circuit board
261 Cooling fan 300 Blue light source device
301 Blue light source 305 Condensing lens group
310 heat sink

Claims (8)

A fluorescent wheel in which phosphor layers are arranged circumferentially;
A driving device for rotating the fluorescent wheel;
A light source for irradiating excitation light to the phosphor layer of the luminescent wheel,
And irradiation control means for controlling the lighting start timing of the light source,
And irradiation time integrator for integrating by dividing the excitation light irradiation time to the fluorescent wheel by the light source for each of a plurality of predetermined regions of the luminescent wheel,
Accumulated time storage means for storing the irradiation time for each of the predetermined areas accumulated by the irradiation time accumulation means;
Wherein stored in the accumulation time storage unit based on between time totalization for each predetermined region, and the irradiation range control means for equalizing the time the excitation light into a plurality of predetermined regions are irradiated of the fluorescent wheel,
Light source apparatus comprising: a. Rotation position detecting means for detecting a rotation reference position provided on the fluorescent wheel
Further comprising
The irradiation range control means includes:
When the accumulated time of any of the predetermined areas stored in the accumulated time storage means exceeds a predetermined value, based on the rotation reference position of the fluorescent wheel detected by the rotation position detecting means by the irradiation control means. 2. The light source device according to claim 1, wherein the time when the excitation light is irradiated to a plurality of predetermined regions of the fluorescent wheel is equalized by changing a lighting start timing of the light source. 3. The light source device according to claim 1, wherein the phosphor wheel is coated with phosphors of the same color component over the entire circumference. The irradiation time integrating means, any one of claims 1 to 3 the value obtained by multiplying a coefficient corresponding to the light intensity in the irradiation time by the intensity of the excitation light and the irradiation time, characterized in that a totalized The light source device according to 1. Rotation position detecting means for detecting a rotation reference position provided on the fluorescent wheel
Further comprising
The driving device rotates driving the luminescent wheel at a constant speed,
The irradiation range control means, wherein, characterized in that turning on the rotational position detecting means by Rikai rolling reference position detected is delayed during a certain predetermined time from the time the irradiation control means controls to the light source Item 5. The light source device according to any one of Items 2 to 4 . When the irradiation control means irradiates excitation light from the light source in one frame for 1 / j period, and the driving device rotates the fluorescent wheel at a speed that is not an integral multiple of j per frame rate,
The irradiation range control means equalizes the time during which excitation light is irradiated to a plurality of predetermined areas of the fluorescent wheel based on the integration time of each predetermined area stored in the integration time storage means. The light source device according to any one of claims 1 to 5. The light source device according to any one of claims 1 to 6 , a display element, a light source side optical system and a light guide optical system for guiding light from the light source device to the display element, and the display element A projector comprising: a projection-side optical system that projects an image emitted from the projector onto a screen; and a projector control unit that controls the light source device and the display element. A red light source emitting red wavelength band light;
A blue light source emitting blue wavelength band light;
An excitation light source that emits excitation light;
A fluorescent wheel in which phosphor layers emitting green wavelength band light upon receiving excitation light from the excitation light source are arranged circumferentially;
A light source side optical system for condensing the red wavelength band light, the blue wavelength band light, and the green wavelength band light on the same optical path;
A driving device for rotating the fluorescent wheel ;
And irradiation control means for sequentially emitting said red wavelength band light and the light in the blue wavelength band and the green wavelength band light,
And irradiation time integrator for integrating by dividing the excitation light irradiation time to the fluorescent wheel by the excitation light source for each of a plurality of predetermined regions of the luminescent wheel,
Accumulated time storage means for storing the irradiation time for each of the predetermined areas accumulated by the irradiation time accumulation means;
Wherein stored in the accumulation time storage unit based on between time totalization for each predetermined region, and the irradiation range control means for equalizing the time the excitation light into a plurality of predetermined regions are irradiated of the fluorescent wheel,
A projector comprising:

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